Dynamics of Drop Impact on a Rectangular Slot

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• 作者：Hariprasad J. Subramani ; Talal Al-Housseiny ; Alvin U. Chen ; Mingfeng Li ; Osman A. Basaran
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2007
• 出版时间：September 12, 2007
• 年：2007
• 卷：46
• 期：19
• 页码：6105 - 6112
• 全文大小：479K
• 年卷期：v.46,no.19(September 12, 2007)
• ISSN：1520-5045

文摘

Drop impact on substrates is of scientific importance and plays a central role in both microscale and large-scale applications, e.g., ink-jet printing and spray coating. For over 100 years, researchers have studied situationswhere drops impact planar substrates, a beautiful free surface flow resulting in either drop deposition orsplashing. By contrast, drop impact on nonplanar substrates, e.g., spheres, has become of interest only recently.Here, the impact of drops of several liquids with a slot of width comparable to the drop diameter that is duginto an otherwise planar substrate is studied experimentally as a function of impact velocity. Two differentkinds of splashing arise in the new experiments: an internal splash similar to that observed on planar substratesand a new, external splash, where some of the drop liquid splashes out of the slot. Phase diagrams thatdelineate regimes of drop spreading and splashing are presented. Simple scaling arguments are also developedto rationalize the findings.